Router bit for scraper bowl

ABSTRACT

A hard metal protective bit for the forward, lower edges of the bowl of an earth-moving scraper, which bit is bifurcated to provide protection to both sides of the leading edge and bisymmetric to permit its use interchangeably on the two edges. It is held in place by retaining pins which do not have projecting parts subject to wear and deformation in use.

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[151 nnnwev 1 lFelb, 22, 11972 2,831,275 4/1958 Kimsey et al ..37/14l 3,032,901 5/1962 Dils ..37/14l 3,088,232 5/1963 Gilbertson.... ...37/14l 3,456,370 7/1969 Gilbertson ..37/l4l Primary Examiner-Edgar S. Burr Attorney-Fryer, Tjensvold, Feix, Phillips & Lempio [5 7] ABSTRACT A hard metal protective bit for the forward, lower edges of the bowl of an earth-moving scraper, which bit is bifurcated to provide protection to both sides of the leading edge and bisymmetric to permit its use interchangeably on the two edges. It is held in place by retaining pins which do not have projecting parts subject to wear and deformation in use.

3 Claims, 6 Drawing Figures ELBdEJE? PMMFEB 22 1912 SHEET 1 [1F 3 INVENTORS GREGORY M. BENNING DENNIS E SHIPP PMENIEUFEBEB am SHEET 0F 3 gm E? INVENTORf; GREGORY M. BENNING DENNiS Ev SHIPP Wm 22 1M 3,, m 3 T SHEET 3 UF 3 2O ZO ZO INVENTOR GREGORY M. BENNI DENNIS E. SHIPP ROUTER BIT FOR SCRAPER BOWL The location and general arrangement of bits on an earthmoving scraper bowl is shown in US. Pat. No. 2,831,275 to W. P. Kimsey, et al. for Reversible Bit For Scraper Bowl Edges. As explained in that patent, bits are particularly useful in connection with earth-moving scrapers having an open end material collecting and conveying bowl provided with a cutting blade extending transversely of the forward edge of the bottom of the bowl. In addition to the transverse edge, it is customary to attach short cutting bits or blades to the outside of the lower, leading edges of the vertical walls of the scraper bowl. The purpose of these bits is to slice through the earth as the implement is moved forwardly when the bowl is being filled to insure a clean cut. Another function of the bits is to protect the lower, leading edges of the bowl which, because of their movement through the earth, are subject to an exceedingly high rate of wear. Were bits not used, it would be necessary periodically to cut away the worn parts of the bowl and replace them with sections welded into place.

Previously known bits have protected only one side of the bowl wall and have been secured in place by bolts or the like with projecting parts which are subject to deformation during use, often making it most difficult to remove the bits when they are worn. The bits of the present invention overcome the before-mentioned difficulties and their construction as well as the manner of attaching them to the bowl is set forth in detail in the following specification wherein reference is made to the accompanying drawings.

In the drawings:

FIG. 1 is a view in side elevation of the lower, forward edge of a scraper bowl to which is secured a bit embodying the present invention;

FIG. 2 is a sectional view taken on the line II-II of FIG. ll;

FIG. 3 shows a modified form of the bit shown in FIG. 1 which is of a two-part construction;

FIG. 4 shows a section of a bit shown in FIG. 3 taken on the line IVIV of FIG. 3;

FIG. 5 is a view of a still further modification of the bit of the present invention; and

FIG. 6 is a sectional view taken on the lines VI-VI of FIG. 5.

In FIG. 1 of the drawings, the lower, forward edge of one side of a scraper bowl is shown at 10 and the blade which extends transversely of the bottom of the bowl is shown at 12. A central or stinger bit portion of the blade extends further than the side portions and is indicated at 14. The bit of the present invention is shown at 16.

In FIG. 2, the sidewall of the bowl is shown as made of spaced plates in this area and extending downwardly from between the spaced plates and secured thereto preferably by welding is a central plate 18. The hardened bit 16 is of substantially the same width of the sidewall 10 where it is made of spaced plates and has a bifurcated upper edge which embraces the plate 118 and is secured thereto as by pins such as shown at 20. The pins may be any one of many types used, for example, to secure tips on rippers or teeth on shovels and the like. In the present instance, the pin passes through registering holes in the bit and in the member 18 and has a central split ring in a groove which expands outwardly against the hole in the member 18 to provide a friction fit. With this type of retaining member, instead of bolts with projecting parts, wear of the bit and pin does not prevent the pin from being easily driven out with the use of proper tools.

A modified form of the invention is shown in FIGS, 3 and 4 wherein the bowl wall is shown at 10a and the bit assumes the form of two hardened members which are identical and, therefore, interchangeable as to position so if the lower or horizontal member wears at a different rate than the forward or vertically extending member, their positions may be reversed. These bit parts are, as shown in FIG. 4, also fastened by pins 20 to a member 18a which extends downwardly from between the two-part bowl wall 10a.

In FIGS. 5 and 6, a still further modification is shown in which a bit shown at 16b has considerabl larger sidewalls than the bits of the other modifications and its over a wall 101;

of the scraper which is made of a single thicker plate. Again, the pins 20 are employed for holding the bit in place.

In all modifications shown, the upper portion of the bit is of bifurcated construction so that it can embrace the wall of the scraper bowl and protect both sides thereof. Also, each bit or part of the bit as shown in FIG. 3 is bisymmetric so that it may be transferred from one side of the scraper bowl to the other if the bits tend to wear more in one area than in another.

What is claimed is:

ll. In an earthmoving device having a sidewall with interior and exterior surfaces, a protective bit means for a lower for ward edge portion of said sidewall, said bit means including an elongated hardened bit member which. has a straight-profile, work-surface engaging edge portion and which has a sidewall engaging edge portion which is bifurcated and which receives a portion of said sidewall between its bifurcations, said bifurcations extending continuously along the entire length of said sidewall engaging edge portion, said portion of said sidewall having a first predetermined transverse thickness, said sidewall, except for said sidewall portion, having a second predetermined transverse thickness between said interior and exterior surfaces which is greater than said first predetermined thickness, said sidewall engaging edge portion being of a thickness no greater than said second thickness and positioned within the confines of said interior and exterior surfaces registering aperture means in each of said bifurcations and said wall portion and fastening means extending completely through said aperture means to secure said bit means to said sidewall portion.

2. The invention of claim 1 wherein said straight-profile, work-surface engaging edge portion has a tapered, V-shaped, cross-sectional cutting configuration.

3. The invention of claim 1 wherein said bit means includes two separate, identical, interchangeable bit members, one of which fits on the lower bottom part of said sidewall and the other on the lower forward part of said sidewall. 

1. In an earthmoving device having a sidewall with interior and exterior surfaces, a protective bit means for a lower forward edge portion of said sidewall, said bit means including an elongated hardened bit member which has a straight-profile, worksurface engaging edge portion and which has a sidewall engaging edge portion which is bifurcated and which receives a portion of said sidewall between its bifurcations, said bifurcations extending continuously along the entire length of said sidewall engaging edge portion, said portion of said sidewall having a first predetermined transverse thickness, said sidewall, except for said sidewall portion, having a second predetermined transverse thickness between said interior and exterior surfaces which is greater than said first predetermined thickness, said sidewall engaging edge portion being of a thickness no greater than said second thickness and positioned within the confines of said interior and exterior surfaces registering aperture means in each of said bifurcations and said wall portion and fastening means extending completely through said aperture means to secure said bit means to said sidewall portion.
 2. The invention of claim 1 wherein said straight-profile, work-surface engaging edge portion has a tapered, V-shaped, cross-sectional cutting configuration.
 3. The invention of claim 1 wherein said bit means includes two separate, identical, interchangeable bit members, one of which fits on the lower bottom part of said sidewall and the other on the lower forward part of said sidewall. 